Overview Apex is the algorithmic-trading engine built on the Fusion substrate. Battle-tested sub-strategies, broker-agnostic execution, full audit chain through Cortex. Local-first: your keys, your broker, your trades. Where to start Concepts. Engine, sub-strategies, gates, audit chain. The mental model in 5 minutes. Quickstart. Fastest path to a running paper-trading engine, with three deployment modes (Standalone / Connected / Managed). Hosting. Production-grade VPS / Docker / NUC / Mac / Pi guides for when you're past the smoke test. What you'll get An engine that takes market bars in, runs them through strategies + risk gates, submits orders through your broker, and writes every decision to an append-only audit chain. A cloud dashboard that monitors the engine and gives you operator controls (start/stop strategies, kill switch, watchlist edits), without ever holding your broker keys. An HTTP API (apex serve + apex-api) for B2B integrators who want to build their own UI on top. Deeper dives Architecture. The hybrid-SaaS split and why it exists. Security. What stays on your hardware vs. what Fusion sees, resource by resource. Operations. The 3am reference for running live. Templates. Copy-paste Compose, systemd, Hetzner cloud-init, Fly. Status Pre-alpha. Alpha access by application: request access.